ASTM EStandard Test Method for Determining Volume 1 95 % Con? dence Interval Multipliers No. of Fields n 5 6 7 8 9 10 11 12 13 ASTM Standard E, using an image analysis routine with Leica .. of Constructional Steel Research 64(11) doi: / ASTM E Standard Test Method for Determining Volume Fraction by Systematic Manual Point Count. Front Cover. American Society for Testing and.
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The value of the multiplier, t, can be found in Table 1.
Repeated point count measurements on an individual micrograph is not allowed. This test method has been described 4 as being superior to other manual methods with regard to effort, bias, and simplicity. If you feel that your comments have not received a fair hearing you should make atm views known to the ASTM Committee on Standards, at the address shown below. If no sample heterogeneity is indicated that is, the con?
ASTM E562 – 11
The average point fraction for n measured? Guidelines are given in 7. Table 3 gives a guide to the number of?
The point grid, with four times the number of grid points, decreased? It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
To avoid bias, questionable points should be counted as one half. A number in parentheses indicates the year of last reapproval. Do not observe the image while translating to a new? Link to Active This link will always route to the current Active version of the standard. Summary of Test Method 4.
However, it should be recorded since it may have an effect upon the precision obtained. The equations for calculating these values are as follows: Two common types of grids circular astk square array are shown in Fig.
asrm Standard Test Method f Aastm are given in 9. Published June 10, It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Table 2 provides guidelines for this selection. This time estimate can probably be decreased to 15 min after some experience and familiarity with the point counting procedure and the microstructure analyzed are obtained. The use of —point grid facilitates easy volume percent calculations.
These values were calculated under the assumption that the features have a random distribution upon the metallographic section.
Guidelines are given in Section 8. Work Item s – proposed revisions of this standard. Precision and Bias 5 Current edition approved April 10, ASTM International takes no position respecting the validity of any patent rights asserted in connection with any asym mentioned in this standard.
Astn superscript epsilon e indicates an editorial change since the last revision or reapproval. Historical Version s – view previous versions of standard. Originally published as E — Point counting measurements should be completed on different? Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm.
Improving the Volume Fraction Estimate Diagrams of two possible grids, one with a circular pattern and one s562-11 a square pattern, which are recommended for use, are shown in Fig.
This can be accomplished by moving the x and y stage mechanism a? This can be achieved by using either a circular grid or a square grid placed at an angle to the microstructural periodicity.
Historical Version s – view previous versions of standard Work Item e62-11 – proposed revisions of this standard Translated Version s: Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
This test method is based upon the stereological principle that a grid with a number of regularly arrayed points, when systematically placed over an image of a two-dimensional section through the microstructure, can provide, after a representative number of placements on different fields, an unbiased statistical estimation of the volume fraction of an identifiable constituent or phase 1, 2, 3.
ASTM International – Standard References for ASTM E – 11
Any number of clearly distinguishable constituents or phases within a microstructure or macrostructure can be counted using the method. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend. The values in Table 2 do not correspond to theoretical constraints; but, by using these values, empirical observations have shown that the method is optimized for a given precision.
If another method of? A grand average can be calculated by taking the average of the set means in this case. Thus, the method can be applied to any type of solid material from which adequate two-dimensional sections can be prepared and observed.
NOTE 1— Table 1 gives the appropriate multiplying factors t for any number of? This additional effort should reduce the con?